For some flocks, it's easy to sort out just be looking at the eggs and knowing the breeds. In that example, the Barred Plymouth Rock would lay medium or large brown eggs, and the Silkie would lay small white or off-white eggs.
The two eggs in your photo look green to me, so they would be from two of the Easter Eggers.
The Barred Plymouth Rocks should lay brown eggs.
The Marans should lay darker brown eggs.
The Silkies should lay smaller eggs than any of the others, in either white or light brown.